Recording medium, its manufacturing method, mother disc for recording medium, and its manufacturing method
US7952985B2 · kind B2 · utility
3Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2008 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Aug 8, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/25715
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording medium is provided and includes; a substrate having a first area formed with a first groove and a second area formed with a second groove, at least one information layer provided on the substrate, and a protecting layer provided on the information layer. Predetermined binary information has previously been recorded on the first groove and the first groove is shallower or narrower than the second groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.